A file of signals intelligence reports, messages, and correspondence issued by the Government Code and Cypher School and sent by the head ('C') of the Secret Intelligence Service (MI6) to the Prime Minister, Winston Churchill. This file includes the following reports: Naval Headlines; from the Turkish ambassador accredited to the Yugoslav government in Cairo, describing Balkan politics; on South Europe: of a reference to the 75th Army Corps and a new army boundary, on January 27, with a query from the Prime Minister (PM); and the Chief of the Imperial General Staff's (CIGS's) explanation of German military organisation in Italy on February 2.